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I share mutual friends with a lot of people on Facebook, yet on some they don’t show up. It shows that we have 12 mutual friends, but I only see 4. How does that happen? For example, one friend has her friends list hidden, but I still see two of our mutual friends (even though I know we have more like six)

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The number of mutual friends now includes mutual friends whose accounts have been disabled, but these friends are not displayed. Also, if the person's full list of friends is hidden to you, a mutual friend who also has their full list of friends hidden to you will not be displayed as a mutual friend.

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In other words, if a mutual friend's friend list is hidden, it will not be show up. – Anwar Nov 11 '13 at 13:25
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@Anwar: If either of the two people have their Friends visible to you then you will see them in Mutual Friends. Only if both of them have their Friends hidden then you won't see them. – mark4o Nov 11 '13 at 15:59

If both of your friends hide their friends list then they will not show up on your mutual friends list hence the reason for the difference in the count.

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protected by Al E. Jan 2 '14 at 18:31

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